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Critical severity9.8NVD Advisory· Published Jul 2, 2021· Updated Jun 17, 2026

CVE-2021-35209

CVE-2021-35209

Description

An issue was discovered in ProxyServlet.java in the /proxy servlet in Zimbra Collaboration Suite 8.8 before 8.8.15 Patch 23 and 9.x before 9.0.0 Patch 16. The value of the X-Host header overwrites the value of the Host header in proxied requests. The value of X-Host header is not checked against the whitelist of hosts Zimbra is allowed to proxy to (the zimbraProxyAllowedDomains setting).

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

37
  • Zimbra/Collaboration34 versions
    cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*+ 33 more
    • cpe:2.3:a:zimbra:collaboration:*:*:*:*:*:*:*:*range: >=8.8,<8.8.15
    • cpe:2.3:a:zimbra:collaboration:8.8.15:-:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p10:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p11:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p12:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p13:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p14:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p15:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p16:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p17:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p18:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p19:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p1:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p2:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p3:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p4:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p5:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p6:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p7:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p8:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:8.8.15:p9:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:-:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p10:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p11:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p12:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p1:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p2:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p3:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p4:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p5:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p6:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p7:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p8:*:*:*:*:*:*
    • cpe:2.3:a:zimbra:collaboration:9.0.0:p9:*:*:*:*:*:*
  • Zimbra/Zimbra Collaboration Suitedescription
  • Zimbra/Zimbrallm-fuzzy
    Range: <8.8.15 Patch 23, <9.0.0 Patch 16
  • Zimbra/Zimbra Collaboration (ZCS)llm-fuzzy
    Range: <8.8.15 Patch 23, <9.0.0 Patch 16

Patches

Vulnerability mechanics

References

5

News mentions

0

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